Battery not holding a charge for very long |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Battery not holding a charge for very long |
KaptKaos |
Jul 16 2012, 09:39 PM
Post
#1
|
Family Group: Members Posts: 4,009 Joined: 23-April 03 From: Near Wausau Member No.: 607 Region Association: Upper MidWest |
It might be old, I need to go check the date code. Are there any tests I can run with a multimeter at the battery to see if there is a draw when its off??
TIA |
CG-914 |
Jul 16 2012, 10:01 PM
Post
#2
|
Member Group: Members Posts: 323 Joined: 27-December 10 From: LA/OC CA Member No.: 12,526 Region Association: Southern California |
just drive to a local auto parts store they can test it for free with a load test too!
|
ruby914 |
Jul 16 2012, 10:03 PM
Post
#3
|
Senior Member Group: Members Posts: 720 Joined: 26-April 09 From: Hawthorne, Ca Member No.: 10,305 Region Association: None |
I went through a crazy witch hunt on that not long ago with the WRX914.
Some thought it was all the WRX electronics, some the alternator. In the end, I think, some of the 3 wires to the front turn lamps may have been switched and that may have had something to do with it. (IMG:style_emoticons/default/confused24.gif) You ever get that targa top cleaned up? |
Cap'n Krusty |
Jul 16 2012, 10:05 PM
Post
#4
|
Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
And, if you're lucky, their test will actually work, giving you an accurate and truthful result.
The Cap'n |
toolguy |
Jul 16 2012, 10:11 PM
Post
#5
|
Senior Member Group: Members Posts: 1,268 Joined: 2-April 11 From: San Diego / El Cajon Member No.: 12,889 Region Association: Southern California |
the idiot proof test is pull off the battery lead and see if it still goes dead. .
I didn't think I'd have to say without the engine running. . but yes no engine running. . . |
McMark |
Jul 16 2012, 10:57 PM
Post
#6
|
914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
If you have a multimeter with an Amps setting, you can use that. Just pull the negative battery cable and touch one lead to the cable and one lead to the battery - terminal. Just make sure you don't have an amp or any other high draw components turned on. My meter maxes at 10A.
Of course, I don't have a baseline for you, but I can if you PM me as a reminder. |
kerensky |
Jul 16 2012, 10:58 PM
Post
#7
|
Senior Member Group: Members Posts: 531 Joined: 1-February 06 From: Norman, OK Member No.: 5,508 Region Association: Southwest Region |
the idiot proof test is pull off the battery lead and see if it still goes dead. . |
Dave_Darling |
Jul 16 2012, 11:09 PM
Post
#8
|
914 Idiot Group: Members Posts: 14,987 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
I think he means without the engine running. That will definitely tell you if the battery itself is toast; if it starts out the evening charged and is dead by morning even when not plugged in!
IIRC, the draw on the 914 with the key off is on the order of 50-100 milliamps (0.05 to 0.1 amp) or less. I forget what the amp-hour capacity of the batteries usually is, but I think it's over 50 A-H. And 0.1 amps would take 500 hours to drain a 50 A-H battery completely. --DD |
ThePaintedMan |
Jul 17 2012, 07:19 AM
Post
#9
|
Advanced Member Group: Members Posts: 3,886 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States |
Having worked at Autozone, I'd try the overnight test that Dave and the guys suggested first. The load-testing equipment most FLAPS use is shotty at best. I had known bad batteries test good multiple times.
|
KaptKaos |
Jul 17 2012, 08:17 AM
Post
#10
|
Family Group: Members Posts: 4,009 Joined: 23-April 03 From: Near Wausau Member No.: 607 Region Association: Upper MidWest |
Oddly enough, it started up fine this morning.
I think I need to go through and check all of my grounds and connections. More to follow..... |
McMark |
Jul 17 2012, 09:04 AM
Post
#11
|
914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Poor/corroded cable connections can cause problems like this as well. I had someone call me because their car wouldn't start. I had them loosen and twist the battery connections and it fired right up.
|
toolguy |
Jul 17 2012, 09:06 AM
Post
#12
|
Senior Member Group: Members Posts: 1,268 Joined: 2-April 11 From: San Diego / El Cajon Member No.: 12,889 Region Association: Southern California |
Joe
. that's not so strange. . . I had an almost new OEM battery in my truck go dead overnight once, and didn't leave anything on. . had me stumped. . I recharged it and it's never done it again and that was 5 years ago. Go figure. . .If it happen again to you, you'll need to figure out what is drawing current. . another way is to remove all the fuses, and replace one every day till the problem re occurs. . this will give you a general clue. But there are a number of wires that are un-fused also. Like the interior light or an unswitched radio left on. Maybe this is an opportunity to learn to use a multimeter real good. . . the meter method described above is looking for a wire that has a current [miliamp] draw with the ignition switch off. |
brant |
Jul 17 2012, 09:57 AM
Post
#13
|
914 Wizard Group: Members Posts: 11,625 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
I really don't trust the test equiptment at FLAPS
I've had many batteries fail their tests and even when the batteries seem to not be bad yet.... I always assumed that those tests were skewed to sell new batteries. you can make a brand new battery fail if you set the thresh-hold high enough |
Lo-Fi Version | Time is now: 20th May 2024 - 05:56 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |